Reviewed by Darin.

    Reviewed by Darin.

        <rdar://problem/3960196> AX Crash in DOM::Range::setStartBefore

        * khtml/xml/dom_docimpl.cpp:
        (DocumentImpl::getAccObjectCache):
        Adjust when detecting cache in non-top level WebArea.
        * kwq/KWQAccObject.mm:
        (-[KWQAccObject textUnderElement]):
        (-[KWQAccObject accessibilityAttributeValue:]):
        Make sure the elements document is the current one for the part.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8411 268f45cc-cd09-0410-ab3c-d52691b4dbfc